Javascript quiz questions

Is it valid to pass an anonymous function as an argument to another function?

1. True

2. False

Which of the following statements is valid for the features of JavaScript?

1. JavaScript is a lightweight, interpreted programming language.

2. All

3. JavaScript is designed for creating network-centric applications.

4. JavaScript is complementary to and integrated with Java.

What is the result of the below JavaScript code when the functions get called in the order as mentioned?

function first() {
    window.a = 3;
}
function second() {
    alert(a);
}

1. 0

2. 3

3. null

4. undefined

Which of the following function of String object produces an HTML hypertext link for requesting another URL?

1. link()

2. sup()

3. small()

4. sub()

Which of the following function of String object would compare a regular expression with a string?

1. search()

2. match()

3. replace()

4. concat()

Which is the use of typeof operator in JavaScript?

function() {
    var a = 10;
    if(a > 5) {
        a = 7;
    }
    alert(a);
}

1. Its value is a string indicating the data type of the operand.

2. The typeof is a unary operator. It should occur before the single operand, which can be of any type.

3. Both of the above.

4. None

Select a function of Array object which returns a new array comprised of the current array /or its value(s)?

1. concat()

2. pop()

3. push()

4. some()

Select a String function that creates a string and display in a big font as if it were in a tag?

1. big()

2. blink()

3. italics()

4. anchor()

Which of the following JavaScript code snippet would create an object?

function() {
    var a = 10;
    if(a > 5) {
        a = 7;
    }
    alert(a);
}

1. var holder = new Object();

2. var holder = Object();

3. var holder = new OBJECT();

4. var holder = new holder();

What is the result of the below JavaScript code when the functions get called in the order as mentioned?

var a = 5;
function first() {
    a = 6;
}
function second() {
    alert(a);
}

1. 0

2. 5

3. null

4. undefined

5. 6

Which of the following method of Boolean object returns a string depending upon the value of the object?

1. toSource()

2. toString()

3. valueOf()

4. None

What is the output of the following JavaScript snippet?

function() {
    var a = 10;
    if(a > 5) {
        a = 7;
    }
    alert(a);
}

1. null

2. 7

3. undefined

4. 10

Which of the following is the output of the below JavaScript code?

  var x = [typeof x, typeof y][1];
  typeof typeof x;

1. "number"

2. "string"

3. "undefined"

4. "object"

Which of the following is the output of the below JavaScript code?

function() {
    if(true) {
        var a = 5;
    }
    alert(a);
}

1. undefined

2. 5

3. null

4. 0

Which of the following will return the type of the arguments passed to a function?

1. using getType function

2. using typeof operator

3. Both of the above.

4. None

Which of the following function of String object returns the capitalized string while respecting the current locale?

1. toLocaleUpperCase()

2. substring()

3. toUpperCase()

4. toString()

What is the function of Array object that adds and/or removes elements from an array?

1. toSource()

2. sort()

3. unshift()

4. splice()

When executed, the below JavaScript code will pop up three alerts. Identify the corret answer?

var a = 6;
function test() {
    var a = 7;
    function again() {
        var a = 8;
        alert(a);  // A
    }
    again();
    alert(a);  // B
}
test();
​alert(a);​  // C

1. 8; 6; 7

2. 7; 6; 8

3. 6; 7; 8

4. 8; 7; 6

Which of the following methods removes the last element from an array and returns that element?

1. pop()

2. get()

3. last()

4. None

What is the function of Array object that runs through each element of the array?

1. concat()

2. forEach()

3. every()

4. filter()